Not very nice, you children should play nicely.......You should both realize that the assignment of numbers (and letters) on those menus is not necessarily "poured in concrete", and can be different at different shops.
Ok, rachana189, HARIBHARAT got to File Manager, now what option of File Manager did you use, not the number, but the text next to the number?

Find the dsn for the copylib dataset. Go into View (usually option 1 from the Primary Option Menu) and enter the Data Set Name. When the list of members is displayed, place an 's' beside the copybook you want to see. You will be able to see the copybook fields.

If your site has FileAid, use the View function (in FileAid) and you can see a formatted layout of your copybook. This view will give you the length and displacement of each field.

An ISPF option like 1.2.5.7.9.0 is just a fastpath through the panels.
Any of the panels can have (and almost certainly will have) been tailored for additional options or facilities, local utilities, the variations are almost limitless.

IBM FileManager is what I believe we are talking about and it is IBM's competitor to FileAid, aimed to hit users of FA that don not require all of its many and varied features. Having said that it is very full function and compares with FA in both Foreground and Background processing.
I happen to like it and have, in fact, had occasion to customize it at Customers' in the past.

It is one of the AD Tools raft of products which are purchased separately from IBM so may or may not exist at any installation. Furthermore it can as easily be at 3.77.F as it can U.1 depending on the (installation standards or) zaniness of your sysprogs!

If you look at the panelid for option 13.2 and browse the panel itself (TSO ISRDDN; L ISPPLIB; find member <panelid>) and see what PGM/CMD/PANEL is in the ZSEL for option 13 there the that will be the option.